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STR #2427
| Application: | FLTK Library |
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| Status: | 5 - New |
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| Priority: | 3 - Moderate, e.g. unable to compile the software |
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| Scope: | 2 - Specific to an operating system |
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| Subsystem: | Unassigned |
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| Summary: | Strange cursor behavior in child GlWindow |
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| Version: | 2.0-current |
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| Created By: | don_dempsey |
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| Assigned To: | Unassigned |
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| Fix Version: | Unassigned |
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| Update Notification: | |
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Trouble Report Files:
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Trouble Report Comments:
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| #1 | don_dempsey
21:35 Oct 07, 2010 |
| Inside the handle() method of a GlWindow that is a child of a Window, my code changes the cursor's display type based on the event parameter that was provided. I handle the events fltk::ENTER and fltk::MOVE by attempting to change the cursor to CURSOR_CROSS and I handle fltk::LEAVE by changing the cursor back to CURSOR_DEFAULT. The cursor changes as expected upon an fltk::ENTER event but immediately changes back to CURSOR_DEFAULT when the next event is handled (usually fltk::MOVE).
Note that if the left mouse button is down while the mouse enters the child GlWindow, the cursor behaves correctly (remaining CURSOR_CROSS until fltk::LEAVE is handled and it returns to CURSOR_DEFAULT).
Also note that this only appears to occur in Windows (tested on XP and Windows 7).
The following test code can be used to reproduce the error:
/*-----------------------------------------------------------*/
// Compiled on my ubuntu and msys boxes with fltk2-config
// --use-gl --configure text.cxx
// linked against ws2_32.lib, fltk2.lib, fltk2_gl.lib,
// glu32.lib and opengl32.lib under msvs
#include <fltk/GlWindow.h>
#include <fltk/events.h>
#include <fltk/Cursor.h>
#include <fltk/run.h>
#include <fltk/gl.h>
#include <cstdio>
using namespace fltk;
class RR_GlWindow : public GlWindow {
void draw() {
if (!valid()) {
valid(1);
glLoadIdentity();
glViewport(0,0,w(),h());
glOrtho(-w(),w(),-h(),h(),-1,1);
}
glClearColor(1.0, 1.0, 1.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
// Draw white 'X'
glColor3f(0.0, 0.0, 0.0);
glBegin(GL_LINE_STRIP);
glVertex2i(w(), h());
glVertex2i(-w(),-h());
glEnd();
glBegin(GL_LINE_STRIP);
glVertex2i(w(),-h());
glVertex2i(-w(), h());
glEnd();
}
public:
RR_GlWindow(int x, int y, int w, int h, const char* label=0) :
GlWindow(x,y,w,h,label) {};
int handle(int e) {
int ret = GlWindow::handle(e);
switch(e) {
case fltk::ENTER:
this->cursor(CURSOR_CROSS);
return 1;
default:
return ret;
}
}
};
int main(){
Window win(10, 10, 1000, 800, "");
win.begin();
RR_GlWindow mygl(10, 10, 400, 400);
win.end();
win.show();
return run();
}
/*-----------------------------------------------------------*/
Note that fltk::MOVE and fltk::LEAVE are not handled in the code example (as described above) but these are not required in order to demonstrate the incorrect cursor behavior. | |
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